하천 및 호소수 수질관리를 위한 자동측정망의 설계

최지용,박원규,이상일,Choi, Ji-Yong,Park, Won-Kqyu,Lee, Sang-Il 한국수자원학회 1996 물과 미래(한국수자원학회지) Vol.29 No.2

하천 및 호소수 수질의 온라인 계측을 위한 수질자동측정망의 설계에서 측정위치와 항목의 선정은 전체시스템의 성능을 결정짓는 중요한 인자이다. 본 논문에서는 상수원유역의 상시수질감시 및 사전경보 기능을 갖는 측정망의 구축이 측정위치와 항목을 결정하는 방법을 연구하였다. 측정위치를 결정하기 위한 선정기준은 상수취수량과 고정오염원의 위치를 바탕으로 대상지역에 대한 거시적 후보지점을 선정한 뒤, 구체적인 지점은 오염물질 유하거리를 기준으로 단계적으로 결정한다. 측정항목은 유역의 오염특성과 수질오염사고 이력을 참고하되, 경제적인 측면을 고려하여 필수측정항목과 선택항목으로 나누어 위치별로 달리하는 방안을 제시하였다. 제안방법을 낙동강유역에 적용함으로써 측정망 구성과정을 예시하였다. In designing automatic water quality monitoring networks for a river basin, determination of measurement locations and items is critical to the effectiveness of the total system. In this paper we studied how to decide these two design factors when a monitoring network is designed for the purposse of water quality surveillance and emergency alarm. For measurement locations, candidate sites are chosen based on the intake amount for water supply and the point sources of contamination. Then, detailed locations are decided according to the contaminant flow distance. As for measurement items, characteristics and the accident history of water pollution in the basin must be taken into account. Considering economic aspects, we proposed a two-stage measurement plan: basic components for all locations and selective ones variable for different locations. Proposed methodology is demonstrated through a case study for Nak-dong River Basin.

하천수질관리를 위한 종합수질지표의 개발과 적용

최지용,신은성 ( Ji Yong Choi,Eun Sung Shin ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.4

To assist in the dissemination of water quality information to expert as well as layman, Korea Water Quality Index(K-WQI) has been developed. The K-WQI is based on ten physico-chemical and biological determinants which were adopted by an intensive interview and questionnaire survey, and a review of water quality criteria. The sub-index is developed by use of both opinion research and mathematical techniques. The former involves the completion of a series of questionnaires by a panel of water experts thus facilitating the objective selection, transformation and weighting of determinants. The latter involves the use of regression for the construction of the sub-index functions. Aggregation for sub-index is used weighted product function. The weighted product, when applied to decreasing scale subindices, does not exhibit eclipsing. Application of the K-WQI to water quality data, drawn from a selection of Korean river reaches typifying a range of river qualities, has shown that the Index not only act as indicators of water quality change, but can also indicate the effects of these changes on potential water use.

증기터빈 바이패스밸브 케이지 유동장 해석관한 연구

최지용,조안태,김광용,Choi Ji-Yong,Cho An-Tai,Kim Kwang-Yong 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.4

In the present work, characteristics of the flow in the cage of a steam turbine bypass control valve for thermal power plant are investigated. Experimental measurement for wall static pressure has been carried out to validate numerical solutions. And, the flowfield is analyzed by solving steady three-dimensional Reynolds-averaged Navier-Stokes equations. Shear stress transport (SST) model is used as turbulence closure. The effects of the flow area between stages of the cage on the pressure drop are also found.

비점오염원 관리정책의 현황과 전망

최지용,Choi, Ji-Yong 한국수자원학회 2006 물과 미래(한국수자원학회지) Vol.39 No.12

한란의 급속증식을 위한 생장조절물질과 항산화제 처리 효과

최지용(Choi Ji-Yong),고태신(Ko Tae-Sin),소인섭(So In-Sup),이종석(Lee Jong-Suk) 한국원예학회 1998 원예과학기술지 Vol.16 No.1

춘란과 한란의 분재배에 있어 근권온도가 생육에 미치는 영향

최지용(Choi Ji-Yong),소인섭(So In-Sup) 한국원예학회 1998 원예과학기술지 Vol.16 No.3

유역관리를 통한 한강상류의 효율적인 탁수관리 방안

최지용(Ji-Yong Choi) 경기연구원 2006 경기논단 Vol.8 No.3

Recently, turbidity problem occurring in many lakes is regarded as a serious problem in the upper Han river basin. Turbidity exceeding a constant level causes aesthetic problem, drops value as water resources, and gives a bad influence to waterbodies and surrounding ecosystem. It is very urgent to look for the fundamental causes of long term influence by turbidity in multipurpose dams, and to get measures about it. Korea Government is executing basic investigation about turbidity for many years and measures to solve the problems. These measures can be categorized to “measures in a lake”, “downstream measures” and “measures through watershed management”. The first and the second correspond to “measures after influx” and the last one is included in “measures before influx”. A preventive technique through watershed management is thought as the most effective measure when taking into consideration both in water quality and quantity management aspect including nonpoint source. Therefore, this study focused on “measures before influx” and tried to propose an efficient management toward turbidity control. As the objective of the study, we chose Soyang dam, where turbidity is becoming a problem because of its long detention time. Once a turbidity problem occurs in a multipurpose dam, its management becomes very difficult, therefore, turbidity management must focus finally on “measures before influx”. For this, we have to approach to the problem with both “upstream management” and “system improvement”.

대흥란의 수분 특성과 RAPD에 의한 근연관계 분석

최지용(Choi Ji-Yong),김정선(Kim Chung-Sun),류기현(Ryu Ki-Hyun),소인섭(So In-Sup) 한국원예학회 1999 원예과학기술지 Vol.17 No.5

유효 및 총불투수율의 산정과 유역관리에서의 활용방안

최지용 ( Ji Yong Choi ),고은주 ( Eun Ju Koh ) 한국환경정책평가연구원 2008 환경정책연구 Vol.7 No.3

불투수면 비율은 유역의 건전성 정도를 나타내는 중요한 척도로 활용되고 있으며 특히 유역의 수환경특성을 파악하는 모델에서 이용되어 왔다. 불투수면은 총불투수면과 유효불투수면의 두 가지 있으며, 이들은 각 유역의 토지이용 특성에 따라 그 구성이 다양하다. 이중 총 불투수면은 기존의 토지이용도나 토지피복도를 사용하여 손쉽게 구할 수 있는 반면 유효불투수면은 물 흐름을 필지별로 파악하여야 하기 때문에 산정에 많은 노력과 비용이 소요된다. 본 연구에서는 우리나라 사례지역에 대해 총불투수면과 유효불투수면을 산정하여 그 특성을 상호 비교해 보고 유역관리에 있어 유효 및 총 불투수면 비율의 적용방안을 모색하고자 하였다. 사례지역 분석결과 유효불투수면 면적은 39.7%로 총 불투수면 면적 43%에 비해 약 3%적었다. 불투수면이 수환경에 미치는 영향을 분석하기 위한 기초 자료로 활용하기 위함임을 고려할 때 비용과 시간적 측면에서 볼 때 총불투수면을 유역의 대표적인 불투수면 비율로 사용할 수 있을 것으로 판단된다. The impervious cover ratio has been used as an important measure for tracing water environment characteristics in watershed. Impervious cover is divided into total impervious cover and effective impervious cover, and its size varies depending on the land use characteristics of a watershed. Total impervious cover can be easily measured using existing land use maps or land cover map, while it takes a considerable amount of time and labor to measure the effective impervious cover, as water flow should be identified at each site. This study is intended to calculate the total impervious cover and effective cover of a sample site, compare their characteristics, and find a method to apply effective and total impervious cover ratios toward watershed management. The analysis of the sample site showed that the effective impervious cover rate(39.7%) was less than the total impervious cover rate(43%). This suggests that it would be acceptable, in terms of time and cost, if total impervious cover is applied as the representative impervious cover ratio of a watershed considering that it was used as basic data to analyze the effect that impervious cover has on the water environment.

지속가능한 물 관리를 위한 환경유량의 기능정립에 관한 연구

최지용 ( Ji Yong Choi ) 한국환경정책평가연구원 2007 환경정책연구 Vol.6 No.2

최근 들어 환경생태의 중요성 인식과 풍요롭고 환경적으로 안정된 생활을 영위하고자 하는 국민들의 욕구가 증대하고 있다. 이에 따라 물을 대하는 국민의 요구도 수질 및 수량관리에서 한 걸음 더 나아가 하천의 생태계를 보전하고 하천의 정상적인 기능을 회복시켜 건전한 하천환경 유지에 대한 수요도 증가하고 있다. 이러한 국민의 요구에 부응할 수 있도록 환경유량에 대한 개념을 정립하여 하천관리는 환경유량과 연계하여 취수를 허락하고, 자연에 가깝게 생태계를 보전하고 관리하여야 한다. 우리나라에서 환경유량은 하천관리 측면에서의 하천유지용수 개념으로 도입되었다. 우리나라에서 하천유지용수 산정은 아직도 인간 위주의 용수이용기능을 중점적으로 고려한 것으로 순수한 환경유량의 의미로서 환경생태적 관점에서 정의되고 강조되지 못했다. 환경유량은 하천유지용수에서 더 발전하여 생태계의 건전성 유지에 강조를 둔 새로운 개념으로 전환되어야 한다. 즉. 환경유량은 하천의 기능과 하천이 가지는 본래의 가치를 유지하기 위해 필요한 유량으로 정의하고 이는 각종 경제활동 유지를 위한 용수 공급, 위락, 심미, 수질, 수력발전, 주운 등을 위한 용수와 동일가치 또는 그 이상에서 고려하여야 한다 In recent days, people`s requests about water resources have been developed from managing quality and quantity of water resources to forming a river environment by restoring normal function of river. To meet these requests, it is necessary to establish the concept of environmental flows. In Korea, the environmental flows was introduced as a concept of river maintenance flows in a sense of river management. The function of river maintenance flows has been changed according to what the major issue is in that age such as navigation, water quality, and prevention of saline water intrusion. As the assesment of river maintenance flows in Korea focused mainly on the function of water usage oriented in human, it could not be defined and emphasized in a sense of ecosystem as a pure meaning of environmental flows. And while the existing river maintenance flows are included the assesment of flows, there is not a practical procedure to supply them and the efficient management in a sense of environment is not performed. The environmental flows should be further developed from the river maintenance flows and changed to a new concept focused on maintaining the health of ecosystem. In other words, the environmental flows should be defined as a necessary flows for maintaining the function of river and its original value, and be considered on the same or higher value of flows for maintenance of economic activity, recreation, and power generation.